That means we asked for the information in your entire DNS zone and your DNS server gave it to us. This is generally considered a security issue as it can reveal host names/sub-domains or other DNS records that you don't want disseminated to the public. It is often the first step taken by an attacker looking for ways to exploit your system.

MxToolbox Delivery Center

This is one problem. Inbox providers check every layer.

Gmail, Yahoo! and Outlook check your email at several layers before it reaches the inbox. Delivery Center monitors and manages every one of them, so you find and fix problems before they cost you delivery.

DMARC, SPF & DKIM
Blacklists
Inbox Placement
Spam complaints
Impersonation protection
BIMI
Mailflow

Email MarketersTest inbox placement and stay inside bulk sender spam-rate limits.
DMARC AdoptersSee every sender and know when it's safe to enforce.
IT Email AdministratorsCatch DNS, authentication and mailflow changes with alerts.

See Delivery Center

$129/mo · 30-day money-back guarantee · Compare all plans